struct mpsse_ctx *mpsse_open(const uint16_t *vid, const uint16_t *pid, const char *description,
const char *serial, const char *location, int channel)
{
struct mpsse_ctx *ctx = calloc(1, sizeof(*ctx));
int err;
if (!ctx)
return 0;
bit_copy_queue_init(&ctx->read_queue);
ctx->read_chunk_size = 16384;
ctx->read_size = 16384;
ctx->write_size = 16384;
ctx->read_chunk = malloc(ctx->read_chunk_size);
ctx->read_buffer = malloc(ctx->read_size);
ctx->write_buffer = malloc(ctx->write_size);
if (!ctx->read_chunk || !ctx->read_buffer || !ctx->write_buffer)
goto error;
ctx->interface = channel;
ctx->index = channel + 1;
ctx->usb_read_timeout = 5000;
ctx->usb_write_timeout = 5000;
err = libusb_init(&ctx->usb_ctx);
if (err != LIBUSB_SUCCESS) {
LOG_ERROR("libusb_init() failed with %s", libusb_error_name(err));
goto error;
}
if (!open_matching_device(ctx, vid, pid, description, serial, location)) {
/* Four hex digits plus terminating zero each */
char vidstr[5];
char pidstr[5];
LOG_ERROR("unable to open ftdi device with vid %s, pid %s, description '%s', "
"serial '%s' at bus location '%s'",
vid ? sprintf(vidstr, "%04x", *vid), vidstr : "*",
pid ? sprintf(pidstr, "%04x", *pid), pidstr : "*",
description ? description : "*",
serial ? serial : "*",
location ? location : "*");
ctx->usb_dev = 0;
goto error;
}
err = libusb_control_transfer(ctx->usb_dev, FTDI_DEVICE_OUT_REQTYPE,
SIO_SET_LATENCY_TIMER_REQUEST, 255, ctx->index, NULL, 0,
ctx->usb_write_timeout);
if (err < 0) {
LOG_ERROR("unable to set latency timer: %s", libusb_error_name(err));
goto error;
}
err = libusb_control_transfer(ctx->usb_dev,
FTDI_DEVICE_OUT_REQTYPE,
SIO_SET_BITMODE_REQUEST,
0x0b | (BITMODE_MPSSE << 8),
ctx->index,
NULL,
0,
ctx->usb_write_timeout);
if (err < 0) {
LOG_ERROR("unable to set MPSSE bitmode: %s", libusb_error_name(err));
goto error;
}
mpsse_purge(ctx);
return ctx;
error:
mpsse_close(ctx);
return 0;
}
static int ftdi_quit(void)
{
mpsse_close(mpsse_ctx);
return ERROR_OK;
}